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http.go
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http.go
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/*
* Copyright 2022 The Dragonfly Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package http
import (
"fmt"
"net"
"net/http"
"syscall"
"time"
)
const (
// DefaultDialTimeout is the default timeout for dialing a http connection.
DefaultDialTimeout = 30 * time.Second
)
// HeaderToMap coverts request headers to map[string]string.
func HeaderToMap(header http.Header) map[string]string {
m := make(map[string]string)
for k, v := range header {
m[k] = v[0]
}
return m
}
// MapToHeader coverts map[string]string to request headers.
func MapToHeader(m map[string]string) http.Header {
var h = http.Header{}
for k, v := range m {
h.Set(k, v)
}
return h
}
// PickHeader pick header with key.
func PickHeader(header http.Header, key, defaultValue string) string {
v := header.Get(key)
if v != "" {
header.Del(key)
return v
}
return defaultValue
}
// NewSafeDialer returns a new net.Dialer with safe socket control.
func NewSafeDialer() *net.Dialer {
return &net.Dialer{
Timeout: DefaultDialTimeout,
DualStack: true,
Control: safeSocketControl,
}
}
// safeSocketControl restricts the socket to only connect to valid addresses.
func safeSocketControl(network string, address string, conn syscall.RawConn) error {
if !(network == "tcp4" || network == "tcp6") {
return fmt.Errorf("network type %s is invalid", network)
}
host, _, err := net.SplitHostPort(address)
if err != nil {
return err
}
ip := net.ParseIP(host)
if ip == nil {
return fmt.Errorf("host %s is invalid", host)
}
if !ip.IsGlobalUnicast() {
return fmt.Errorf("ip %s is invalid", ip.String())
}
return nil
}